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The aim of this paper is to newly introduce optimal parameters to the exact linearization, and to apply the proposed method to the nonlinear control of one-machine power system. First, the method introducing parameters is formulated, and the one-machine model system is treated as an example for the application. Then, the power system is exactly linearized without any approximation by the proposed method, and control responses depending on the parameters are numerically calculated. Finally, it is concluded that the method introducing the parameters gives fairly improved control responses of the original power system than the usual exact linearization does.